The writing process for the majority of Metallicaâs albums have followed the same process. A large slew of guitar riffs written primarily by James Hetfield, sometimes Kirk Hammett, and rarely the bandâs bass player, (that now being bass virtuoso Robert Trujillo) are reviewed and selected.
1 Delhi is most polluted city in the world in PM2.5 concentrations. 2  Half of the top 20 most polluted cities were in India, according to data.  PM2.5 is considered most harmful to health.
Top 10 Most Ozone Polluted Cities: Air Quality Index (101-150) 1: Los Angeles â Long Beach, CA: 133: 2: Visalia â Porterville â Hanford, CA: 131: 3: Bakersfield, CA: 129: 4: Fresno â Madera, CA: 128: 5: Sacramento = Roseville, CA: 128: 6: Houston â The Woodlands, TX: 122: 7: Dallas â Fort Worth, TX: 121: 8: Modesto â Merced â Stockton , CA: 117: 9: Las Vegas â Henderson, NV: 114: 10